Pointer to member function error [closed]

问题:

When I am compiling the following piece of code, I am getting the following error. Can anyone help me in resolving this issue. Thank you.

error: ISO C++ forbids taking the address of a bound member function to form a pointer to member function. Say ‘&foo::abc’ [-fpermissive]

boost::thread testThread(boost::bind(&f.abc, f));

........................................................................^

#include <iostream>
#include <boost/asio.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>

class foo
{
    private:

    public:
    foo(){}

    void abc()
    {
        std::cout << "abc" << std::endl;
    }
};

int main()
{
    foo f;

    boost::thread testThread(&f.abc, f);

    return 0;
}

回答1:

The error message couldn't really be any clearer

Say ‘&foo::abc’

boost::thread testThread(boost::bind(&foo::abc, f));
//                                   ^^^^^^^

Also, there's no need for boost::bind, this should work too

boost::thread testThread(&foo::abc, f);

Be aware that both of these make copies of f, if you want to avoid that you should use either of the following

testThread(&foo::abc, &f);
testThread(&foo::abc, boost::ref(f));

---

Now, why on earth is main() a member function of class zoo??

回答2:

Do as the error says, replace f.abc with foo::abc:

boost::thread testThread(boost::bind(&foo::abc, f));

回答3:

Use:

    boost::thread testThread(boost::bind(&foo::abc, f));

回答4:

Do as @Praetorian said. Everything works fine:

//Title of this code
//Compiler Version 18.00.21005.1 for x86

#include <iostream>
#include <boost/asio.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>

class zoo;

class foo
{
    private:

    public:
    foo(){}

    void abc()
    {
        std::cout << "abc" << std::endl;
    }
};

class zoo
{
    public:
    int main()
    {
        foo f;

        boost::thread testThread(boost::bind(&foo::abc, &f));
        testThread.join();
        return 0;
    }
}; 

int main()
{
    zoo{}.main();
}

Live: http://rextester.com/XDE37483